Solvent for acetyl cellulose.



-LLIAM G. LINDSAY, 0F CALDWELL, NEW JERSEY, ASSIGNOR TO THE CELLULOID COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

SOLVENT FOB- ACETYJD CELLULOSE.

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No Drawing.

To all whom it may concern:

Be it known that 1, WILLIAM G. LIND- SAY, a citizen of the United States, residing in Caldwell, county of Essex, State of New Jersey, have invented certain new and useful Improvements in Solvents for Acetyl Cellulose, of which the'following is a specification.

The various compositions to which the present invention relates are employed in the arts, sometimes as imitations of natural substances and sometimes as films which are used for photographic purposes.

though the final or useful'form of the dif' ferent compounds of acetyl cellulose is that of a solid or dry .material, the different processes ofconversion into this final solid form involve, as is well understood, the employment-of solutions or mixtures of varying consistencies as to elasticity, stifiness or I fluidity, depending generally upon the proportion or kind of solvent used to the amount of lose. v In the treatment of acetyl cellulose for the production of solutions for the manufacture of lacquers, varnishes, photographic the original base-acetyl cellul, films, and flexible or plastic compounds I all have discovered that a mixture of ethyl acetate and methyl alcohol constitutes a solvent of that variety of acetyl cellulose which is freely soluble in acetone.

It is well known that eth 1 acetate or acetic ether has been propose as a solvent for the acetone-soluble :variety of acetyl cellulose and that the ethyl acetate found on the market contains varying amounts of ethyl alcohol." I have discovered, however, that when ethyl acetate is diluted'withmethyl alcohol Specification of Letters JPatent.

the commercial or the 100% Patented June 22, iaia.

. Application filed ma as, 1912. Serial No. 699,235.

in certain proportions the mixture exerts an lncreased solvent action on the acetyl cellulose of the variety described for the preparation of acetyl cellulose plastics.

The best proportions I have found are 30% to 40% of methyl alcohol mixed with 60% to 70% of ethyl acetate, and one example ofpractising my invention is as follows :To 100 parts, by weight, of the acetone-soluble variety of 'acetyl cellulose I add 10 to 20 parts, by weight, of paraethyltoluolsulphonamid and 20 to 30 parts of triphenyl phosphate. I incorporate these solid ingredients thoroughly by mechanical stirring and add to the mixture thus obtained from 60 to 70parts, by weight, of a mixture composed of 70 parts, by volume,

of ethvl acetate and 30 parts, by volume,

of methyl alcohol. The mass is then thoroughly incorporated by suitable malaxating or kneading and when a uniform mixture is obtained the excess of solvent is allowed to evaporate and the dough-like product thus obtained is further worked. up according to the method which is well known in the manufacture of 'nitro cellulose camphor compounds.

Having thus described my invention, what lclaim is: I

A solvent for acetyl cellulose of that varietywhich is freely soluble in acetone comprising 60 to 70'parts by volume of ethyl acetate and '30 to v40 parts. by volume of methyl alcohol, substantially as de scribed. I WILLI G, LINDSAY, Witnesses:

RUTH MEYERSON,

' J. E. Hmuon l-lrnn. 

